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三等分点连线围成的三角形特征（唐老师）
Author:
龚洪萍
Topic:
Geometry
GeoGebra
New Resources
讀磅
圓的切線方程
垂直線的斜率
直線的斜率
球体的体积推导（优化版）
Discover Resources
複雜的解法
Copy of 七巧板
正多面體
angle between 2 planes 01
双曲椭圆
Discover Topics
Translation
Volume
Tangent Line or Tangent
Solids or 3D Shapes
Rhombus